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TIL about the "Mosquito Device" a special alarm invented in 2005. The device prevents young people from gathering in public spaces by emitting a dangerously high-frequency sound that is intentionally tuned to be heard primarily by younger people.

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Oo91 TIL some of the Koi San people of southern Africa hunt antelope by chasing them on foot until they get heatstroke. The antelope overheat before the humans do.
VB0em TIL Julia Chinn (c. 1790 – July 1833) was an American plantation manager and enslaved woman of “mixed-race” (an “octoroon” of seven-eighths European and one-eighth African ancestry), who was the common-law wife of the ninth vice president of the United States, Richard Mentor Johnson.
yQwLp TIL that Caroline Kennedy, JFK's daughter, almost became the third Kennedy to be assassinated; an IRA bomb blew up a car she would have been in if not for the British MP hosting her being delayed by a phone call from another MP
drR8 TIL that pinball was banned in NYC as a gambling device until 1976, when Roger Sharpe testified by playing pinball in the courtroom while calling out precisely what he was going to shoot for and scoring - showing that it’s a game of skill and not chance.
9eDD TIL that while the word “thong” comes from the Old English “thwong”, a flexible leather cord, other languages use various euphemisms: in Brazil it is “fio dental” (dental floss); in Bulgarian “prashka” (slingshot); Chinese it is dingziku (丁字褲/丁字裤) which roughly means T-letter pants